/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package vip.zhenzicheng.rocketmq.api.operation;

import org.apache.commons.cli.*;
import org.apache.rocketmq.client.consumer.DefaultMQPushConsumer;
import org.apache.rocketmq.client.consumer.listener.ConsumeConcurrentlyContext;
import org.apache.rocketmq.client.consumer.listener.ConsumeConcurrentlyStatus;
import org.apache.rocketmq.client.consumer.listener.MessageListenerConcurrently;
import org.apache.rocketmq.client.exception.MQClientException;
import org.apache.rocketmq.common.message.MessageExt;

import java.util.List;
import java.util.concurrent.atomic.AtomicLong;

public class Consumer {

  public static void main(String[] args) throws InterruptedException, MQClientException {
    CommandLine commandLine = buildCommandline(args);
    if (commandLine != null) {
      String group = commandLine.getOptionValue('g');
      String topic = commandLine.getOptionValue('t');
      String subscription = commandLine.getOptionValue('s');
      final String returnFailedHalf = commandLine.getOptionValue('f');

      DefaultMQPushConsumer consumer = new DefaultMQPushConsumer(group);
      consumer.setInstanceName(Long.toString(System.currentTimeMillis()));

      consumer.subscribe(topic, subscription);

      consumer.registerMessageListener(new MessageListenerConcurrently() {
        final AtomicLong consumeTimes = new AtomicLong(0);

        @Override
        public ConsumeConcurrentlyStatus consumeMessage(List<MessageExt> msgs,
                                                        ConsumeConcurrentlyContext context) {
          long currentTimes = this.consumeTimes.incrementAndGet();
          System.out.printf("%-8d %s%n", currentTimes, msgs);
          if (Boolean.parseBoolean(returnFailedHalf)) {
            if ((currentTimes % 2) == 0) {
              return ConsumeConcurrentlyStatus.RECONSUME_LATER;
            }
          }
          return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
        }
      });

      consumer.start();

      System.out.printf("Consumer Started.%n");
    }
  }

  public static CommandLine buildCommandline(String[] args) {
    final Options options = new Options();
    Option opt = new Option("h", "help", false, "Print help");
    opt.setRequired(false);
    options.addOption(opt);

    opt = new Option("g", "consumerGroup", true, "Consumer Group Name");
    opt.setRequired(true);
    options.addOption(opt);

    opt = new Option("t", "topic", true, "Topic Name");
    opt.setRequired(true);
    options.addOption(opt);

    opt = new Option("s", "subscription", true, "subscription");
    opt.setRequired(false);
    options.addOption(opt);

    opt = new Option("f", "returnFailedHalf", true, "return failed result, for half message");
    opt.setRequired(true);
    options.addOption(opt);

    PosixParser parser = new PosixParser();
    HelpFormatter hf = new HelpFormatter();
    hf.setWidth(110);
    CommandLine commandLine = null;
    try {
      commandLine = parser.parse(options, args);
      if (commandLine.hasOption('h')) {
        hf.printHelp("producer", options, true);
        return null;
      }
    } catch (ParseException e) {
      hf.printHelp("producer", options, true);
      return null;
    }

    return commandLine;
  }
}
